Data about the thermal efficiency are not complete,
but it is possible to have an idea on the effectiveness of the results obtained in this field of research.
The new materials have excellent perspectives and this will be in the next future one of the main aspect to explore to increase thermal efficiency.
In particular, the coating of Cindrella [14] exhibits very promising properties with excellent results.
Aerogel as thermal insulation material
(Reim et al. )
is an excellent example of how a new material could improve the actual technology without much effort.